CMB Anisotropy Due to Tangled magnetic fields in re-ionized models

Abstract

Primordial tangled cosmological Magnetic Fields source rotational velocity perturbations of the baryon fluid, even in the post-recombination universe. These vortical modes inturn leave a characteristic imprint on the temperature anisotropy of the Cosmic Microwave Background (CMB), if the CMB photons can be re-scatterred after recombination. Observations from WMAP indicate that the Universe underwent a relatively early re-ionization ($z_{ri}\sim 15$), which does indeed lead to a significant optical depth for re-scattering of CMB photons after the re-ionization epoch. We compute the resulting additional temperature anisotropies, induced by primordial magnetic fields in the post-recombination universe. We show that in models with early re-ionization, a nearly scale-invariant spectrum of tangled magnetic fields which redshift to a present value of $B_0\sim 3\times 10^{-9}$ Gauss, produce vector mode perturbations which in turn induce additional temperature anisotropy of about 0.3 to 0.4 $\mu$K over very small angular scales, with $l$ upto $\sim 10000$ or so.

12 pages. Contains one figure. Submitted to Phys. Rev. D

References in corpus (6)

• Wilkinson Microwave Anisotropy Probe (WMAP) First Year Observations: TE Polarization
• The Magnetized Universe
• The Evolution of Cosmic Magnetic Fields: From the Very Early Universe, to Recombination, to the Present
• CMB anisotropies from primordial inhomogeneous magnetic fields
• Small-scale CMB polarization anisotropies due to tangled primordial magnetic fields
• Large Scale Magnetic Fields: Galaxy Two-Point correlation function

Cited by in corpus (14)

• Stringent Limit on Primordial Magnetic Fields from the Cosmic Microwave Background Radiation
• Primordial magnetic field limits from cosmological data
• Primordial Magnetic Field Limits from Cosmic Microwave Background Bispectrum of Magnetic Passive Scalar Modes
• Tight coupling expansion and fully inhomogeneous magnetic fields
• Cosmic Strings as the Source of Small-Scale Microwave Background Anisotropy
• Improved CMB anisotropy constraints on primordial magnetic fields from the post-recombination ionization history
• Alignments in quasar polarizations: pseudoscalar-photon mixing in the presence of correlated magnetic fields
• CMB anisotropies generated by a stochastic background of primordial magnetic fields with non-zero helicity
• Tangled magnetic fields and CMBR signal from reionization epoch
• Polarization Alignment in JVAS/CLASS flat spectrum radio surveys
• Constraining axionlike particles using the distance-duality relation
• A complete 3D numerical study of the effects of pseudoscalar-photon mixing on quasar polarizations
• Extracting Spectral Index of Intergalactic Magnetic Field from Radio Polarizations
• New limit on pseudoscalar-photon mixing from WMAP Observations